Electric fuse and fuse-holder.



P. W. HARRIS ELECTRIC FUSE AND FUSE HOLDER. APPLICATION FILED MAY 9, 1908.

Patented Aug. 8, 1911.

INVENTOR ATTORNEY UNITED STATES rAgENT FORD W. HARRIS, 0F WILKINSBURG. PENNSYLVANIA, ASSIGNOR, BY ASSIGN- KENTS,.TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, OF EAST PITTSBURG, PENNSYLVANIA, A CORPQRATIDN OLE PENNSYLVANIA.

ELECTRIC roar. nun rUsn-rIoLpE-n.

Specification of Letters Patent.

Application filed May 9, 1908.

Serial No. 431,816. v

T 0 all whom it may concern:

Be it known that 1, Form \V. H'Anins, a citizen of the United States, and a resident of \Vilkinsburg, in the county of jrllegheny and State of Pennsylvania, have in vented a new and useful Improvement in Electric Fuses and Fuse-l-Iolders, of'which the following is a specification.

My invention relates to fuses and fuse holders or boxes and it has for its object to provide a fuse and holder that shall be simple in construction and adapted for the in terruption of relatively high voltage circuits.

In order to accomplish. the aforesaid re sult I have provided a magnetizable structure which forms a part of the fuse box and is so arranged as to produce a magnetic field i in the vicinity of that portion of the fuse,

Where rupture is likel to occur, said netic field being prouced by the current traversing the fuse.

Figure l of the accompanyin drawings is a sectional elevation of a evice con- .structed in accordance with my invention.

Fig.2 is a plan View with terminal members removed of the device shown in Fig. 1, and Fig. 3 is a perspective view showing the relation between the fuse and the magnetizable member which form the principal parts of the device.

Referring to the drawings, the device here illustrated comprises a fiber box 1 having an open flared bbttom 2 through which the hot gases, produced by the interruption of the circuit, may be expelled, a flexible strip 2-, terminal members 3 and 4-, clamping screws 5 and 6 and a magnetizable member 7 The box 1 is provided with an inner wall 8 which is in the form of a hollow wedge and confines the fuse to a relatively small space. The ends of the fuse '2 are clamped to the tern'iinal members 3 and 4: and the fuse is made of such length as to form a long U between the two terminals. The member 7 is a (rectangular mugnetizable block, but may be replaced by a ring, or by a continuous member of any other suitable form, to surround the box 1 adjacent to the flared open end The position of the member 7 relative to the fuse is such that the electric current traversing the fuse passes first downwardly and then upwardly through the member 7 as indicated by the arrows 9 in Fig. 3. The downwardly flowing current tends to produce a magnetic ilux traversing themember T in one direction and the upwardly flowing current tends to produce an opposing nmgnetic flux so that the resultant flux as indicated by the arrows l0 and 11, passes in the air through the space between the arms of the fuse in the same direction and through the two ends of the member 7 in opposite directions.

It is evident that a strong magnetic field,

is set up near the middle point of the fuse between its arms. Accordingly, if the fuse is ruptured near its middle point, as is usually the ease, the magnetic field just de- SPF: re: vmg and quenching the are.

The form of the box 1 is such as to prevent the hot gases, )roduced when the circuit is interrupted, rom rising between the terminals 3 and s and such as to assist the magnetic field in dispelling the are.

desire that structural. modifications which do not depart from the spirit of my invention shall be included within its scope.

I claim as my invention:

1. A circuit iutcrupter comprising stationary terminal members, a current-coir ducting fuse of U shape secured to the terminal members and depending therefrom. and a continuous magnetizable member surrounding the lower end of the fuse.

2. A circuit. interrupter comprising a continuous magnetizable member and a current-conducting fuse of U shape which prodownwardly and is surrounded by said magnetizuble member.

5. A circuit interrupter comprising a fusc of insulating material provided with crminal members at its too and having a hae lower end, a fuse or U shape suspended from the terminal members and supbed will be particularly effective in di- Patented Aug. 8, 1911.

In testimony whereof, I have hereunio and produces a magnetic field Within which subscribed my name this 30th day of April, 10

the fuse is partially located.

A fuse box of approximately M-shupe 1908. in longitudinal section and provided with ,v v I ti'Ii'linuis at upper end, a fuse of U V LORD shape suspended from the terminals and ii'nesses:

G. L. Cinns'in AN,

located within the box and a. magnetizable BIRNEY Hixns.

core surrounding the lower end of the box. 

